US6179052B1 - Digital-hydraulic well control system - Google Patents
Digital-hydraulic well control system Download PDFInfo
- Publication number
- US6179052B1 US6179052B1 US09/133,747 US13374798A US6179052B1 US 6179052 B1 US6179052 B1 US 6179052B1 US 13374798 A US13374798 A US 13374798A US 6179052 B1 US6179052 B1 US 6179052B1
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- Prior art keywords
- hydraulic
- fluid
- pressure
- well tool
- lines
- Prior art date
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- Expired - Lifetime
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- 238000004891 communication Methods 0.000 claims description 24
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- 238000013461 design Methods 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
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Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
- E21B47/14—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/16—Control means therefor being outside the borehole
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
Definitions
- the present invention relates to a system for controlling the production of hydrocarbons and other fluids from downhole wells. More particularly, the invention relates to a system for providing hydraulic control signals and power through the same hydraulic line, and for providing integrated control of multiple well tools with a minimal number of hydraulic lines.
- Downhole well tools such as sliding sleeves, sliding side doors, interval control lines, safety valves, lubricator valves, and gas lift valves are representative examples of control tools positioned downhole in wells.
- Sliding sleeves and similar devices can be placed in isolated sections of the wellbore to control fluid flow from such wellbore section.
- Multiple sliding sleeves and interval control valves can be placed in different isolated sections within production tubing to jointly control fluid flow within the particular production tubing section, and to commingle the various fluids within the common production tubing interior.
- This production method is known as “comingling” or “coproduction”.
- Reverse circulation of fluids through the production of tubing known as “injection splitting”, is performed by pumping a production chemical or other fluid downwardly into the production tubing and through different production tubing sections.
- Wellbore tool actuators generally comprise short term or long term devices. Short term devices include one shot tools and tool having limited operating cycles. Long term devices can use hydraulically operated mechanical mechanisms performing over multiple cycles. Actuation signals are provided through mechanical, direct pressure, pressure pulsing, electrical, electromagnetic, acoustic, and other mechanisms. The control mechanism may involve simple mechanics, fluid logic controls, timers, or electronics. Motive power to actuated the tools can be provided through springs, differential pressure, hydrostatic pressure, or locally generated power.
- Interval control valve (ICV) activation is typically accomplished with mechanical techniques such as a shifting tool deployed from the well surface on a workstring or coiled tubing. This technique is expensive and inefficient because the surface controlled rigs may be unavailable, advance logistical planning is required, and hydrocarbon production is lost during operation of the shifting tool. Alternatively, electrical and hydraulic umbilical lines have been used to remotely control one or more ICVs without reentry to the wellbore.
- Control for one downhole tool can be hydraulically accomplished by connecting a single hydraulic line to a tool such as an ICV or a lubricator valve, and by discharging hydraulic fluid from the line end into the wellbore.
- This technique has several limitations as the hydraulic fluid exits the wellbore because of differential pressures between the hydraulic line and the wellbore. Additionally, the setting depths are limited by the maximum pressure that a pressure relief valve can hold between the differential pressure between the control line pressure and the production tubing when the system is at rest. These limitations restrict single line hydraulics to low differential pressure applications such a lubricator valves and ESP sliding sleeves. Further, discharge of hydraulic fluid into the wellbore comprises an environmental discharge and risks backflow and particulate contamination into the hydraulic system. To avoid such contamination and corrosion problems, closed loop hydraulic systems are preferred over hydraulic fluid discharge valves downstream of the well tool actuator.
- a second hydraulic line was added to provide for dual operation of the same tool function by controlling hydraulic fluid flow in different directions.
- U.S. Pat. No. 4,945,995 to Thulance et al. (1990) disclosed an electrically operated solenoid valve for selectively controlling operation of a hydraulic line for opening downhole wellbore valves.
- the present invention provides an apparatus and system for transmitting pressurized fluid between a wellbore surface and a well tool located downhole in the wellbore.
- the apparatus comprises at least two hydraulic lines engaged with the well tool for conveying said fluid to the well tool, and means for pressurizing the fluid within the hydraulic lines.
- the hydraulic lines are capable of providing communication control signals to the well tool are further capable of providing fluid pressure to actuate the well tool.
- at least three hydraulic lines are each engaged with each well tool for selectively conveying the fluid to each well tool, and hydraulic control means engaged between said hydraulic lines and each well tool for selectively controlling actuation of each well tool in response to pressure changes within selected hydraulic lines.
- the invention also provides a system for controlling at least three well tools located downhole in a wellbore.
- the system comprises hydraulic pressure means for selectively pressurizing a fluid, at least two hydraulic lines engaged with the hydraulic pressure means and with each well tool for selectively conveying fluid pressure to each well tool, and hydraulic control means engaged between each hydraulic line and each well tool.
- Each hydraulic control means is operable in response to selective pressurization of one or more hydraulic lines by said hydraulic pressure means, and operation of a well tool through the pressurization of one hydraulic line displaces fluid which is conveyed through another hydraulic line.
- FIG. 1 illustrates a two hydraulic line system for providing hydraulic pressure control and power to well tools.
- FIG. 2 illustrates a graph showing a hydraulic line pressure code for providing hydraulic control and power capabilities through the same hydraulic line.
- FIG. 3 illustrates a three well tool and three hydraulic line apparatus.
- FIG. 4 illustrates a seven well tool and four hydraulic line system for providing selective well control and power.
- FIG. 5 illustrates another seven well tool and four hydraulic line system.
- the invention provides hydraulic fluid control for downhole well tools by uniquely utilizing hydraulics with logic circuitry.
- logic circuitry is analogous to electrical and electronics systems, and depends on Boolean Logic using “AND” and “OR” gates in the form of hydraulic switches.
- digital control capability, or “digital-hydraulics” can be adapted to the control of downhole well tools such as ICVs.
- FIG. 1 illustrates two hydraulic lines 10 and 12 engaged with pump 14 for providing hydraulic pressure to fluid (not shown) in lines 10 and 12 .
- Lines 10 and 12 are further engaged with downhole well tools 16 and 18 for providing hydraulic fluid pressure to tools 16 and 18 .
- Pump 14 can comprise a controller for selectively controlling the fluid pressure within lines 10 and 12 , and can cooperate with a hydraulic control means such as valve 20 located downhole in the wellbore in engagement with lines 10 and 12 , and with tools 16 and 18 .
- Selective control over the distribution of hydraulic fluid pressure can be furnished and controlled with pump 14 at the wellbore surface, or with valve 20 downhole in the wellbore.
- Control signals to tools 16 and 18 and valve 20 can be provided within a different pressure range as that required for actuation of tools 16 and 18 , and the ranges can be higher, lower, or overlapping.
- FIG. 2 illustrates one combination of communication and power functions through the same hydraulic tubing, conduit, passage or line such as line 10 wherein the control signals are provided at lower pressures than the power actuation pressures.
- Pressure is plotted against time, and the hydraulic pressure is initially raised above the communication threshold but below the power threshold. Within this pressure range, communication signals and controls can be performed through the hydraulic line.
- the line pressure is raised to a selected level so that subsequent powering up of the hydraulic line pressure raises the line pressure to a certain level. Subsequent actuation of the well control devices, normally delayed as the pressure builds up within the long hydraulic tubing, occurs at a faster rate because the line is already pressurized to a certain level.
- the invention further permits the use of additional hydraulic lines and combinations of hydraulic lines and controllers to provide a hydraulically actuated well control and power system.
- One embodiment of the invention is based on the concept that a selected number of hydraulic control lines could be engaged with a tool and that control line combinations can be used for different purposes.
- a three control line system could use a first line for hydraulic power such as moving a hydraulic cylinder, a second line to provide a return path for returning fluid to the initial location, and all three lines for providing digital-hydraulic code capabilities.
- Such code can be represented by the following Table:
- codes 000 and 111 would not be used in this embodiment. However, if one or more lines discharged fluid to the outside of the line to the tubing exterior, another tool, or other location, codes 000 and 111 would be useful for transmitting power or signals. If codes 000 and 111 are excluded from use in the inventive embodiment described, the following six codes are available for tool control:
- control line 32 is bled to zero and the entire system is at rest, leaving ICV 22 fully open until further operation.
- control lines 28 , 30 , and 32 can be coded and operated as illustrated. After sufficient time has passed, the system pressure can be increased to operate ICV 24 .
- the degrees of control freedom and operating controls can be represented by the following instructions:
- X the number of independently controlled ICVs
- N the number of control lines.
- N the number of control lines.
- the number of independently and dependently controlled ICVs provides system flexibility in the design of an operating system. For example,
- a four ICV digital-hydraulic control system having seven independent devices and thirteen dependant devices can operate as follows:
- FIG. 4 A representative embodiment of a four hydraulic line system is illustrated in FIG. 4 wherein hydraulic lines 40 , 42 , 44 and 46 are engaged with controller 48 , and are further engaged with hydraulic control means such as module 50 connected to tool 52 , module 54 connected to tool 56 , module 58 connected to tool 60 , module 62 connected to tool 64 , module 66 connected to tool 68 , module 70 connected to tool 72 , and module 74 connected to tool 76 .
- Selective pressurization of lines 40 , 42 , 44 and 46 selectively operates one or more of such seven well tools according to a programmed code as described above. For example, a code of “0010”, wherein all lines are unpressurized except for the pressurization of line 44 , operates to close tool 52 as illustrated.
- control mechanism 78 includes two control modules 80 and 82 each located on opposite sides of the floating piston within ICV 22 .
- Control module 80 includes check valve 83 engaged with line 32 , and further includes check valve 84 engaged with pilot operated valves 86 and 88 .
- Pilot operated valve 86 is engaged with line 30
- pilot operated valve 88 is engaged with line 28 .
- Check valves 90 and 92 and pilot operated valves 94 and 96 are positioned as shown in FIG. 3 for control module 82 . Similar combinations of modules and internal components are illustrated in FIG. 4 and in FIG. 5 for different operating characteristics.
- each control module provides for unique, selected operating functions and characteristics. Depending on the proper sequence and configuration, pressurization of a hydraulic line can actuate one of the tools without actuating other tools in the system. Alternatively, various combinations of well tools could be actuated with the same hydraulic line if desired.
- the invention significantly eliminates problems associated with pressure transients.
- the hydraulic lines are very long and slender, which greatly affects the hydraulic line ability to quickly transmit pressure pulses or changes from the wellbore surface to a downhole tool location.
- five to ten minutes could be required before the hydraulic lines were accurately coded for the communication of sequenced controls. If some of the ICVs were located relatively shallow in the wellbore, such ICVs would receive the code long before other ICVs located deep in the wellbore. This configuration could cause confusion on the digital-hydraulics control circuit.
- a preferred embodiment of the invention utilizes such time delay characteristics by applying the communication coding early at relatively low pressures where the ICVs receive the codes but are not activated, and then the pressure is increased above a selected activation threshold to move the ICVs. This permits communication and power to be transmitted through the same hydraulic lines, and further uses the communication pressures to initially raise the line pressures to a selected level and to shorten the power up time required.
- pistons within an ICV can be moved in a direction from the initial position toward a second position, and can be maintained above second position pressure.
- the device response initially directs the control line pressure to the second side of the piston actuator.
- the piston responds to the force created by the differential pressure, fluid on the low pressure side is displaced into the tubing.
- the device eventually strokes fully and attains the second position, and the fluid will slowly bleed away.
- a representative sequence code for a five line tool system can be expressed as follows:
- the invention is applicable to many different tools including downhole devices having more than one operating mode or position from a single dedicated hydraulic line.
- Such tools include tubing mounted ball valves, sliding sleeves, lubricator valves, and other devices.
- the invention is particularly suitable for devices having, a two-way piston, open/close actuator for providing force in either direction in response to differential pressure across the piston.
- the operating codes described above can be designed to provide a static operating code where the fluid pressures stabilize within each hydraulic line.
- communication control signals can be provided by the presence or absence of fluid pressure, or by the fluid pressure level observed.
- different pressure levels through one or more lines can generate different system combinations far in excess of the “0” and “1” combinations stated above, and can provide for multiple combinations at least three or four time greater.
- a higher order of combinations is possible by using different line pressures in combination with different hydraulic lines.
- the operation of a single line can be pulsed in cooperation with a well tool or a hydraulic control means operation, or can be pulsed in combination with two or more hydraulic lines to achieve additional control sequences.
- Such pulsing techniques further increase the number of system combinations available through a relatively few number of hydraulic lines, thereby providing maximum system capabilities with a minimum number of hydraulic lines.
- the preferred embodiment of the invention permits hydraulic switching of the lines for operation of downhole well tools such as ICVs, switching functions could be performed with various switch techniques including electrical, electromechanical, acoustic, mechanical, and other forms of switches.
- the digital hydraulic logic described by the invention is applicable to different combinations of conventional and unconventional switches and tools, and provides the benefit of significantly increasing system reliability and of permitting a reduction in the number of hydraulic lines run downhole in the wellbore.
- the invention permits operating forces in the range above 10,000 lb. and is capable of driving devices in different directions. Such high driving forces provide for reliable operation where environmental conditions causing scale and corrosion increase frictional forces over time. Such high driving forces also provide for lower pressure communication ranges suitable for providing various control operations and sequences.
- the invention controls a large number of downhole well tools while minimizing the number of control lines extending between the tools and the wellbore surface.
- a subsurface safety barrier is provided to reduce the number of undesirable returns through the hydraulic lines, and high activation forces are provided in dual directions.
- the system is expandable to support additional high resolution devices, can support fail safe equipment, and can provide single command control or multiple control commands.
- the invention is operable with pressure or no pressure conditions, can operate as a closed loop or open loop system, and is adaptable to conventional control panel operations. As an open loop system, hydraulic fluid can be exhausted from one or more lines or well tools if return of the hydraulic fluid is not necessary to the wellbore application.
- the invention can further be run in parallel with other downhole wellbore power and control systems. Accordingly, the invention is particularly useful in wellbores having multiple zones or connected branch wellbores such as in multilateral wellbores.
Abstract
Description
Hydraulic Lines |
#1 | #2 | #3 | Digital Equation | Numeric Value Lines |
0 | 0 | 0 | 0 × 22 + 0 × 21 + 0 × 20 | 0 |
0 | 0 | 1 | 0 × 22 + 0 × 21 + 1 × 20 | 1 |
0 | 1 | 0 | 0 × 22 + 1 × 21 + 0 × 20 | 2 |
0 | 1 | 1 | 0 × 22 + 1 × 21 + 1 × 20 | 3 |
1 | 0 | 0 | 1 × 22 + 0 × 21 + 0 × 20 | 4 |
1 | 0 | 1 | 1 × 22 + 0 × 21 + 1 × 20 | 5 |
1 | 1 | 0 | 1 × 22 + 1 × 21 + 0 × 20 | 6 |
1 | 1 | 1 | 1 × 22 + 1 × 21 + 1 × 20 | 7 |
#1 | #2 | #3 | |||
0 | 0 | 1 | 1 | ||
0 | 1 | 0 | 2 | ||
0 | 1 | 1 | 3 | ||
1 | 0 | 0 | 4 | ||
1 | 0 | 1 | 5 | ||
1 | 1 | 0 | 6 | ||
Hydraulic Line Number |
28 | 30 | 32 | |
0 | 0 | 1 | |
0 | 1 | 0 | |
0 | 1 | 1 | |
1 | 0 | 0 | |
1 | 0 | 1 | |
1 | 1 | 0 | Close ICV 26 |
|
Hydraulic Line Number |
28 | 30 | 32 | |||
0 | 0 | 1 | All ICVs Open | ||
0 | 1 | 0 | |
||
0 | 1 | 1 | |
||
1 | 0 | 0 | |
||
1 | 0 | 1 | Close ICV 34 | ||
1 | 1 | 0 | Close ICV 36 | ||
# of Independent ICVs |
# of Control Lines N |
|
# of Dependent ICVs Z = 2N − 3 |
1 | 0 | 0 |
2 | 1 | 1 |
3 | 3 | 5 |
4 | 7 | 13 |
5 | 15 | 27 |
6 | 31 | 61 |
7 | 63 | 125 |
8 | 127 | 253 |
Hydraulic Line Number |
#1 | #2 | #3 | #4 | Independent | Dependent | ||
0 | 0 | 0 | 1 | Open ICV#1 | All ICVs open | ||
0 | 0 | 1 | 0 | Close ICV#1 | Close ICV#1 | ||
0 | 0 | 1 | 1 | Open ICV#2 | Close ICV#2 | ||
0 | 1 | 0 | 0 | Close ICV#2 | Close ICV#3 | ||
0 | 1 | 0 | 1 | Open ICV#3 | |
||
0 | 1 | 1 | 0 | Close ICV#3 | Close ICV#5 | ||
0 | 1 | 1 | 1 | |
Close ICV#6 | ||
1 | 0 | 0 | 0 | |
Close ICV#7 | ||
1 | 0 | 0 | 1 | Open ICV#5 | Close ICV#8 | ||
1 | 0 | 1 | 0 | Close ICV#5 | Close ICV#9 | ||
1 | 0 | 1 | 1 | Open ICV#6 | |
||
1 | 1 | 0 | 0 | Close ICV#6 | Close ICV#11 | ||
1 | 1 | 0 | 1 | Open ICV#7 | |
||
1 | 1 | 1 | 0 | Close ICV#7 | Close ICV#13 | ||
Communication | |||
Power Lines | Lines |
#1 | #2 | A | B | C | Independent | Dependent |
0 | 1 | 0 | 0 | 0 | Open ICV#1 | All ICVs closed |
1 | 0 | 0 | 0 | 0 | Close ICV#1 | Open ICV#1 |
0 | 1 | 0 | 0 | 1 | Open ICV#2 | Open ICV#2 |
1 | 0 | 0 | 0 | 1 | Close ICV#2 | Open ICV#3 |
0 | 1 | 0 | 1 | 0 | Open ICV#3 | |
1 | 0 | 0 | 1 | 0 | Close ICV#3 | Open ICV#5 |
0 | 1 | 0 | 1 | 1 | |
Open ICV#6 |
1 | 0 | 0 | 1 | 1 | |
Open ICV#7 |
0 | 1 | 1 | 0 | 0 | Open ICV#5 | Open ICV#8 |
1 | 0 | 1 | 0 | 0 | Close ICV#5 | Open ICV#9 |
0 | 1 | 1 | 0 | 1 | Open ICV#6 | |
1 | 0 | 1 | 0 | 1 | Close ICV#6 | Open ICV#11 |
0 | 1 | 1 | 1 | 0 | Open ICV#7 | |
1 | 0 | 1 | 1 | 0 | Close ICV#7 | Open ICV#13 |
0 | 1 | 1 | 1 | 1 | Open ICV#8 | |
1 | 0 | 1 | 1 | 1 | Close ICV#8 | Open ICV#15 |
5 Lines, 8 ICVs | 5 Lines, 15 ICVs | |||||
Claims (23)
Priority Applications (11)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/133,747 US6179052B1 (en) | 1998-08-13 | 1998-08-13 | Digital-hydraulic well control system |
EP03027527A EP1394354B1 (en) | 1998-08-13 | 1999-08-13 | Hydraulic well control system |
BR9912992-2A BR9912992A (en) | 1998-08-13 | 1999-08-13 | Hydraulic well control system |
PCT/GB1999/002694 WO2000009855A1 (en) | 1998-08-13 | 1999-08-13 | Hydraulic well control system |
AU54324/99A AU757201B2 (en) | 1998-08-13 | 1999-08-13 | Hydraulic well control system |
CA002339944A CA2339944C (en) | 1998-08-13 | 1999-08-13 | Hydraulic well control system |
US09/782,742 US6575237B2 (en) | 1998-08-13 | 1999-08-13 | Hydraulic well control system |
EP99940328A EP1105620B1 (en) | 1998-08-13 | 1999-08-13 | Hydraulic well control system |
US09/503,276 US6470970B1 (en) | 1998-08-13 | 2000-02-14 | Multiplier digital-hydraulic well control system and method |
US09/510,701 US6567013B1 (en) | 1998-08-13 | 2000-02-22 | Digital hydraulic well control system |
NO20010713A NO321018B1 (en) | 1998-08-13 | 2001-02-12 | Hydraulic well control equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/133,747 US6179052B1 (en) | 1998-08-13 | 1998-08-13 | Digital-hydraulic well control system |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US09/503,276 Continuation-In-Part US6470970B1 (en) | 1998-08-13 | 2000-02-14 | Multiplier digital-hydraulic well control system and method |
US09/510,701 Continuation-In-Part US6567013B1 (en) | 1998-08-13 | 2000-02-22 | Digital hydraulic well control system |
Publications (1)
Publication Number | Publication Date |
---|---|
US6179052B1 true US6179052B1 (en) | 2001-01-30 |
Family
ID=22460121
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US09/133,747 Expired - Lifetime US6179052B1 (en) | 1998-08-13 | 1998-08-13 | Digital-hydraulic well control system |
US09/782,742 Expired - Lifetime US6575237B2 (en) | 1998-08-13 | 1999-08-13 | Hydraulic well control system |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/782,742 Expired - Lifetime US6575237B2 (en) | 1998-08-13 | 1999-08-13 | Hydraulic well control system |
Country Status (7)
Country | Link |
---|---|
US (2) | US6179052B1 (en) |
EP (2) | EP1394354B1 (en) |
AU (1) | AU757201B2 (en) |
BR (1) | BR9912992A (en) |
CA (1) | CA2339944C (en) |
NO (1) | NO321018B1 (en) |
WO (1) | WO2000009855A1 (en) |
Cited By (50)
Publication number | Priority date | Publication date | Assignee | Title |
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EP1237061A1 (en) * | 2001-03-02 | 2002-09-04 | Thomas Dipl-Ing. Schmidt | Method and device for remote control of a plurality of actuators |
EP1241322A1 (en) * | 2001-03-14 | 2002-09-18 | Halliburton Energy Services, Inc. | Method of controlling a subsurface well tool |
US20030048197A1 (en) * | 2000-02-22 | 2003-03-13 | Purkis Daniel G. | Sequential hydraulic control system for use in a subterranean well |
US6575237B2 (en) | 1998-08-13 | 2003-06-10 | Welldynamics, Inc. | Hydraulic well control system |
US6595296B1 (en) * | 1999-06-10 | 2003-07-22 | Quartech Engineering Limited | Hydraulic control assembly |
US20030226665A1 (en) * | 2002-05-06 | 2003-12-11 | Kevin Jones | Multiple zone downhole intelligent flow control valve system and method for controlling commingling of flows from multiple zones |
GB2392936A (en) * | 2002-09-13 | 2004-03-17 | Schlumberger Holdings | Integrated control of multiple well tools |
US20040084189A1 (en) * | 2002-11-05 | 2004-05-06 | Hosie David G. | Instrumentation for a downhole deployment valve |
US6736213B2 (en) | 2001-10-30 | 2004-05-18 | Baker Hughes Incorporated | Method and system for controlling a downhole flow control device using derived feedback control |
US20040149448A1 (en) * | 2002-12-23 | 2004-08-05 | Frank Akselberg | Method and device for pressure controlled sequential operation |
US20050045327A1 (en) * | 2003-09-03 | 2005-03-03 | Wang David Wei | Gravel packing a well |
US20050230974A1 (en) * | 2004-04-15 | 2005-10-20 | Brett Masters | Vibration based power generator |
US20060098530A1 (en) * | 2004-10-28 | 2006-05-11 | Honeywell International Inc. | Directional transducers for use in down hole communications |
US20060175052A1 (en) * | 2005-02-08 | 2006-08-10 | Tips Timothy R | Flow regulator for use in a subterranean well |
US20060192160A1 (en) * | 2004-01-09 | 2006-08-31 | Cove Harry R | Linear hydraulic stepping actuator with fast close capabilities |
US20060237196A1 (en) * | 2005-04-20 | 2006-10-26 | Tips Timothy R | Direct proportional surface control system for downhole choke |
US20060266513A1 (en) * | 2005-05-31 | 2006-11-30 | Welldynamics, Inc. | Downhole ram pump |
US20070012455A1 (en) * | 2005-07-15 | 2007-01-18 | Smithson Mitchell C | Method and associated system for setting downhole control pressure |
US7242103B2 (en) | 2005-02-08 | 2007-07-10 | Welldynamics, Inc. | Downhole electrical power generator |
US20070187091A1 (en) * | 2006-02-13 | 2007-08-16 | Baker Hughes Incorporated | Method and system for controlling a downhole flow control device |
US7475732B2 (en) | 2002-11-05 | 2009-01-13 | Weatherford/Lamb, Inc. | Instrumentation for a downhole deployment valve |
US7484566B2 (en) | 2005-08-15 | 2009-02-03 | Welldynamics, Inc. | Pulse width modulated downhole flow control |
US20090243875A1 (en) * | 2008-03-26 | 2009-10-01 | Schlumberger Technology Corporation | System and method for controlling multiple well tools |
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Also Published As
Publication number | Publication date |
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WO2000009855A9 (en) | 2000-06-22 |
EP1105620B1 (en) | 2004-04-21 |
BR9912992A (en) | 2001-12-26 |
NO20010713L (en) | 2001-04-17 |
EP1394354A3 (en) | 2006-06-07 |
NO321018B1 (en) | 2006-02-27 |
AU757201B2 (en) | 2003-02-06 |
US20020007946A1 (en) | 2002-01-24 |
EP1105620A1 (en) | 2001-06-13 |
US6575237B2 (en) | 2003-06-10 |
WO2000009855A1 (en) | 2000-02-24 |
EP1394354A2 (en) | 2004-03-03 |
NO20010713D0 (en) | 2001-02-12 |
AU5432499A (en) | 2000-03-06 |
EP1394354B1 (en) | 2007-07-25 |
CA2339944A1 (en) | 2000-02-24 |
CA2339944C (en) | 2007-06-26 |
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